JPS621031B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for preventing thread fraying of a sewn product by applying an adhesive in advance to the part to be cut in the sewn product to prevent fraying of the sewing thread at the cut portion.

Normally, for example, seat covers for automobiles are made by inserting urethane foam between the decorative fabric or leather sheet that makes up the surface layer and the cotton fabric or nylon nonwoven fabric that makes up the lining, and then sewing them together using synthetic resin sewing thread. It is manufactured by sewing, so-called quilting, but in order to improve productivity, these materials are wound into a roll and are sequentially unwound and sewn continuously with a sewing machine to create a long sewn product. After that, a cutter device is used to cut the material to the required length according to the dimensions of the seat, etc.

As a result, the sewing thread is also cut as the sewing product is cut, and there is a risk that the sewing thread may become frayed at the cut portion and the stitched portion may open. In particular, since a double chainstitch sewing machine is used for this type of sewing, the upper thread and lower thread are likely to separate, and fraying of the sewing thread is fatal.

Conventionally, a heated trowel was pressed against the seam at the cutting point to weld the upper and lower threads together.
Alternatively, measures have been taken to prevent fraying by jetting high-temperature hot air from an air nozzle onto the sewing thread to weld the upper thread and lower thread to each other.

However, according to the former method, in this type of sewn product in which a large number of seams are formed in the longitudinal direction, there are many welding points, making the welding work troublesome and inefficient.

On the other hand, in the latter case, which involves welding by jetting hot air,
Recently, nylon-based nonwoven fabrics have been frequently used as linings for seat covers, which has had the disadvantage that the nonwoven fabrics melt before the sewing threads are welded by hot air.

The present invention has been made in view of the above circumstances, and the present invention is made by applying an adhesive liquid to the sewing thread located at the location where the sewing product is to be cut using an applicator roll. In addition to preventing the adhesive from fraying, by contacting the circumferential surface of the coating roll with a spatula having a notched groove at the tip, the adhesive remains in a band shape only in a predetermined area of the coating roll and is sent between the coating roll and the coating roll. To provide a device for preventing thread fraying of a sewn article, which applies adhesive liquid only to predetermined portions of the sewn article by pinching and pressing the supplied sewn article at a position facing a belt-shaped adhesive liquid layer.

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings.

In the figure, reference numeral 1 denotes a support frame of the present device, and a support stand 2 is disposed at an intermediate portion thereof. Reference numeral 3 denotes a liquid tank disposed on the support base 2, and the inside thereof is filled with a molten adhesive liquid 4.

A heater (not shown) is provided at the bottom of the liquid tank 3 so that the solid synthetic adhesive is heated and melted in the liquid tank 3.

Reference numeral 5 denotes a scooping roll which is driven to rotate by immersing a part of its peripheral surface 5a in the adhesive liquid 4 in the liquid tank 3, and as it rotates, the adhesive liquid 4 adheres to its peripheral surface 5a and is scooped up. That's what I do.

Reference numeral 6 denotes a coating roll which is arranged parallel to this scooping roll 5 with a small gap and is driven to rotate, and the adhesive liquid scooped up by the scooping roll 5 is spread around the periphery of this coating roll 6 side. It is made to adhere uniformly to the surface 6a.

7 is a tip portion 7a on the circumferential surface 6a of the coating roll 6.
It is a spatula with a plurality of notched grooves 7b in contact with each other, and its tip 7a has a plurality of notched grooves 7b...
... is provided, and by bringing this spatula 7 into contact with the circumferential surface 6a of the application roll 6, this circumferential surface 6a
The adhesive liquid attached to a is removed to a predetermined area, that is, the notch groove 7.
The adhesive liquid is left only on the area where the adhesive is applied, and drips off the adhesive on other areas, that is, the area where the tip 7a of the spatula 7 is in direct contact, to form a strip in the circumferential direction of the applicator roll 6. An adhesive liquid layer 9 is formed.

10... are disk-shaped pressure rolls disposed at positions facing the adhesive liquid layer 9 formed on the circumferential surface 6a of the coating roll 6, and fixed to the support frame 1 side. Air cylinder 11, 11
The application roller 6 is driven forward and backward toward the coating roll 6 side.

That is, each of the pressure rolls 10...... each includes a pressure arm 13 that is fitted at a predetermined interval on a shaft 12 that is pivotally supported in a direction perpendicular to the feeding direction α of the sewing product 8. It is rotatably supported at the tip via a support shaft 14. Each of the pressure arms 13 is fixed to the shaft 12 via screws 13a, and when adjusting the interval between the pressure rolls 10, the screws 1
All you have to do is loosen 3a and slide it in the direction of the shaft 12.

Furthermore, connecting links 1 are provided at both ends of the shaft 12.
5 and 15 are fitted, and the respective distal ends of the actuating rods 11a and 11a of the air cylinders 11 and 11 are connected to the distal ends of the connecting links 15 and 15, respectively.

Further, a bracket 16 having an L-shaped cross section is fixed to the base end of each of the pressure arms 13, a rod 17 is inserted through the bracket 16 from the distal end side, and a pressure spring 18 is wound around the rod 17. The tip of the rod 17 is fitted into a recess 19 provided in the middle of the pressurizing arm 13. Further, a through hole (not shown) is provided at the tip of the rod 17, and the locking pin 20 inserted from the side surface of the pressure arm 13 is inserted into the hole. It is attached to the 13 side. Further, a retaining ring 21 is fitted to the base end of the rod 17, and the retaining ring 21 is fixed to the rod 17 via a screw 22. The pressure spring 18 has elasticity so that when the pressure roll 10 is pressed against the application roll 6 side, the pressure roll 10 has elasticity and is pressed against the application roll 6 side. .

Further, a feeding roll 23 whose both ends are pivoted to the frame 1 side and is rotationally driven is disposed below the pressure roll 10. This feed roll 2
A rubber covering layer 23a is provided on the outer periphery of the sewing material 3 to prevent the sewing material 8 from slipping.

Further, a bar-shaped pressure roll 24 is provided parallel to the feed roll 23 and driven back and forth in the direction of the feed roll 23.

This pressure roll 24 is rotatably supported by a shaft 26 supported by the tips of pressure arms 25, 25 fitted to both ends of the shaft 12. In other words, the pressure roll 24 is controlled by the air pressure of the air cylinders 11, 11.
When the sewing product 8 is pinched by the feeding roll 23 and the pressure roll 24, the sewing material 8 is pressed against the feeding roll 23 and the pressure roll 24 during the pinching period. It is adapted to be fed along the direction α.

Incidentally, sprockets 30, 31, and 32 are provided at one end of each of the feed roll 23, scooping roll 5, and application roll 6, and each sprocket 30, 31, and 32 is connected to a drive motor fixed to the frame 1 side. The feed roll 23, the scooping roll 5, and the coating roll 6 are connected to each other by a single chain 35 together with the sprockets 33, and the drive motor 3
3 so that it is constantly driven to rotate. 3
Reference numerals 6, 37, 38, and 39 are idle rollers that are appropriately arranged on the feed path of the sewing material 8, and only the idle roller 38 is provided so as to be movable up and down along the frame 1, and is adapted to the cutting length of the sewing material 8. The vertical position can be adjusted accordingly.

Note that the spatula 7 has screws 41 on the support plate 40...
This support plate 40 is removably attached to a support plate 42 provided integrally on the frame 1 side via fastening means such as screws 43.

Further, the sewn article 8 coated with the adhesive by this device is fed to a cutting machine disposed adjacent to the left side in FIG. 1 and cut into a suitable length.

Further, heaters are provided in the scooping roll 5 and the application roll 6 to prevent the adhesive liquid adhering to the peripheral surfaces 5a and 6a of each roll 5 and 6 from being cooled and solidified.

According to such a configuration, the adhesive liquid 4 in the liquid tank 3
is uniformly adhered to the circumferential surface 6a of the applicator roll 6 via the scooping roll 5. Peripheral surface 6a of coating roll 6
There are cutout grooves 7b in accordance with the sewing intervals of the sewing material 8.
Since the spatula 7 provided with... is brought into contact, only the adhesive liquid in the area where the notched groove 7b... is provided remains on the application roll 6 side, and a band-shaped adhesive liquid layer 9... ...is formed.

Therefore, when the air cylinders 11, 11 are driven, the pressure rolls 10 advance toward the application roll 6, and the sewing product 8 is sandwiched between the pressure rolls 10 and the application roll 6. At the same time, the sewing product 8 that the pressure roll 24 has advanced toward the feed roll 23 side is pinched by the pressure roll 24 and the feed roll 23, so that it is pinched by both rolls 23 and 24. During the period, the sewing material 8 is fed by a fixed amount by the feeding roll 23. Therefore, as shown in FIG. 5, on the back side of the sewing product 8, only the adhesive layer 9 adhering to the applicator roll 6 is formed into a strip for a certain distance, which is fed by the feed roll 23. is applied to.

By the way, since the adhesive liquid layer 9 is formed in accordance with the sewing position of the sewing product 8, the adhesive liquid is reliably applied to the sewing thread 8a, and the upper thread and lower thread, which are the sewing threads, are coated with the adhesive liquid with certainty. The threads are adhered to each other and integrally to the lining of the sewn article 8.

Therefore, when such a sewn product 8 is fed to the cutting machine and cut, the sewing threads are glued together and are integrated, so even if the sewing threads are cut,
There is no risk of it fraying from the cut point.

Further, since unnecessary adhesive liquid is dripped off from the applicator roll 6 by the spatula 7, the adhesive liquid does not adhere to the non-sewn parts of the sewing product 8, and the adhesive liquid does not adhere to the non-sewn parts of the sewing product 8. There is no risk that the entire sewn article 8 will harden.

Furthermore, since the spatula 7 is removably attached to the frame 1 side, if the sewing interval of the sewing product 8 is changed, replace it with a spatula 7 provided with notched grooves 7b according to the interval. This can be easily dealt with by doing this.

Also, a pressure roll 10 is pressed against the application roll 6 side.
is made into a disk shape so that only the sewing parts where the adhesive is to be applied are pressed against the applicator roll 6, so that the seams that were hidden by the urethane foam etc. can be removed by the applicator roll. The sewing thread is pushed out to the 6 side, and the adhesive liquid is reliably applied to the sewing thread. Further, by simply moving the pressure roll back from the coating roll side, it is possible to avoid applying the adhesive liquid to unnecessary areas. For example, in the embodiment, the adhesive liquid is applied depending on the driving time of the air cylinders 11, 11. The length can be adjusted arbitrarily. Note that the timing of driving the air cylinders 11, 11 is appropriately set in conjunction with the cutting machine side in accordance with the length of the sewing material 8 to be cut.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG.
The figure is a perspective view of the main parts of the same embodiment, Fig. 3 is a front view of the main parts of the same embodiment, Fig. 4 is a side view showing the drive system of the same embodiment, and Fig. 5 is a side view showing the drive system of the same embodiment. FIG. 3...Liquid tank, 4...Adhesive liquid, 5...Scooping roll, 6...Applying roll, 7...Spatula, 7b...
Notch groove, 8...Sewn article, 9...Adhesive liquid layer, 10...
...Pressure roll.

Claims (1)

[Claims] 1. A liquid tank filled with an adhesive liquid, a scooping roll whose peripheral surface is partially immersed in the adhesive liquid in the liquid tank, and is driven to rotate so that the adhesive liquid adheres to the peripheral surface;
An applicator roll is arranged with a small gap from this scooping roll and is driven to rotate, and causes the adhesive liquid scooped up by the scooping roll to adhere to the circumferential surface, and the tip part is brought into contact with the circumferential surface of the applicator roll. let me,
A spatula provided with a notched groove to leave the adhesive adhered to the coating roll in only a predetermined area and scrape off other areas to form a band-shaped adhesive liquid layer in the circumferential direction of the coating roll, and the coating roll. When the sewing product is moved forward and backward in the direction of the applicator roll, the sewing product that is fed between the applicator roll and the application roll is clamped at a position facing the adhesive liquid layer, and the adhesive that has adhered to the application roll side is removed from the sewing product side. 1. A device for preventing thread fraying of a sewn article, characterized in that it is equipped with a pressure roll that applies the coating to the fabric.